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SLOTH BEAR

443

and the Thibetan Blue Bear (U~. jpruinosus) are distinct species,
not to be confounded with U. aretos. Neither, of course, are the
Peruvian U. ornatus and the Sun Bear, 17. rnalayanus.

The  Polar Bear has  even  been  placed  in  a  separate  genus,

Thalassarctos, a proceeding which is quite unnecessary* The
white colour of this Bear tends to become browner with age. It
is one of the few mammals which extend right round the pole;
the Polar Bear is of course a purely Arctic animal. The chief food

of the  Polar  Bear  is  Seal.     Out  of thirty Bears examined, Mr.

Jb'iu. *2'2Z>.ŚMalayan Bear.     T7r$tt$ malayanus.     x j'o.
Koettlitz found that only fifteen had animal remains in their
stomachs, and these remains were invariably SeaL The animal
apparently hunts by scent rather than by sight or hearing, both of
which senses seem to be somewhat dull. The males and females
wander separately, except of course during the breeding season.
The Bears dig holes in which they may remain for some time,
but there is no hibernation. In Pleistocene times, the Polar
Bear extended as far south as Hamburg. The female has four
mammae, pectoral in position.
Melnrs-iis includes only M. lahiat-us, the Sloth Bear of India.
This animal has an upturned snout, which is described as closely
resembling that of JHfydaits, the Teledu. The snout has no groove.